Ace Combat 5: The Unsung War

Ace Combat 5: The Unsung War is a combat flight simulation video game developed and published by Namco for the PlayStation 2. It is the fifth installment of the Ace Combat series. A limited number of the games were bundled with the Hori Flightstick 2 accessory.

Ace Combat 5 features more than fifty licensed real-world jet aircraft. Nonetheless, the game's events and locations are set in a fictional world. The game's main campaign is set during a war between the fictional nations of Osea and Yuktobania. The storyline revolves around the player character "Blaze", an Osean fighter pilot who leads a four-plane unit known as Wardog Squadron as they attempt to ward off the Yuktobanian invasion of their homeland and uncover the truth about the war. Unlike its predecessors, Ace Combat 5 does not include a multiplayer mode, as developers did not have enough extended time to implement one.

Although a majority of the gameplay in Ace Combat 5 remains similar to that of its predecessor, Ace Combat 04: Shattered Skies, several notable additions were made. Among these additions are an arcade mode and the ability for the player to interact with wingmen. The multiplayer mode present in previous titles, however, was scrapped during development. The game received generally favorable reviews, although critics noted that the game was not the "revolutionary step forward for the series" that Shattered Skies was.

The game was rereleased on the PlayStation 4 in 2019, as part of a pre-order bonus for Ace Combat 7: Skies Unknown. Bandai Namco has since clarified that it is not a remaster, but instead a port of the PlayStation 2 original, running natively on the PlayStation 4 at higher resolutions.